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

Authors: Liu, Chuan | Chen, Renwen | Zhang, Yuxiang | Wang, Liping | Qin, Jinchang

Article Type: Research Article

Abstract: Converting persistent and renewable wave energy into electricity has been studied in recent years. This research develops a novel fully floating three-body direct-drive wave energy converter (DD-WEC) prepared for the research of the multi-body DD-WEC. Its prototype consists of three floating bodies, but both three bodies act as buoys to extract the wave energy, not just a body. And the relative motion of the buoys induces the voltage in Halbach array permanent magnet linear generators coils. Its feasibility is investigated theoretically by analyzing the dynamics of motion of the floating buoys. As a result, parametric design of the WEC is …achieved. The load performance of the DD-WEC is investigated by using the Simulink, and it can be found that the relative displacements between buoys are different. Then, the electromagnetic power of the proposed WEC is much higher compared to a two-body DD-WEC by using numerical simulation Finally, the DD-WEC prototype is manufactured and tested in the wave tank. The results show that the WEC can produce the most electricity for the case with the wave period of 1.6 s, and the maximum voltage reaches 14.2 V, which is consistent with the simulation results. The results show that the proposed DD-WEC is well suited for wave energy conversion. Show more

Keywords: Three-body, direct-drive wave energy converter, Halbach permanent magnet linear generator, electromagnetic power

DOI: 10.3233/JAE-201566

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-16, 2020

Authors: Zhao, Qiang | Zhu, Baoquan | Pei, Yulong | Wang, Na

Article Type: Research Article

Abstract: This paper investigates how to control suspension system and steering system to cooperatively ensure their performance. A model predictive controller is designed for their integrated model, which includes three parts: predictive model, rolling optimization and online correction. Repeated online optimization is based on actual output feedback information, real-time consideration of the impact of uncertainties, and timely correction. The simulation results show that the integrated model predictive control effect of steering system and suspension system is better than those of non-integrated passive control and integrated optimal control. The ride comfort, handling stability and driving safety of the vehicle are all improved …with the integrated model predictive control. Show more

Keywords: Integrated control, model predictive algorithm, electric power steering, active suspension

DOI: 10.3233/JAE-201519

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-21, 2020

Authors: Sato, Mitsuhide | Nirei, Masami | Yamanaka, Yuichiro | Bu, Yinggang | Mizuno, Tsutomu

Article Type: Research Article

Abstract: A linear generator system based on a free-piston engine is expected to be a highly efficient power-generation engine for series hybrid vehicles. However, the engine generator must produce in a limited installation space the very high power required to drive a car. Consequently, considering the car-mounting situation, higher power density is required by means of reduced generator size and higher efficiency. In this paper, a cylindrical double-stator linear synchronous generator with opposing permanent magnets is used for free-piston engine. The double stator realizes smaller size, and using opposing magnets achieves a larger thrust constant than that with a single stator. …In a finite-element analysis, the high-efficiency area is expanded compared to a surface-magnet type of the same size. Furthermore, this paper clarifies the effectiveness for improved power density with maximum-generation control in a simulation of a dual-sided engine model. Show more

Keywords: Finite-element analysis, internal combustion engine, permanent magnet machine, power generation control

DOI: 10.3233/JAE-190158

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-16, 2020

Authors: Borges, José William Ribeiro | Fonseca, Wellington da Silva | Brasil, Fernando de Souza | Araújo, Ramon C.F.

Article Type: Research Article

Abstract: The electrical insulation is one of the main sources of failures in hydro-generators, therefore it is important to research the insulation system of stator bars. In this paper, it is developed a steady-state multiphysics analysis of a stator bar using the Finite Element Method to assess its steady-state behavior in the electrical, magnetic and thermal domains. Different aspects are analyzed in simulations, such as capacitance, mechanical stress and thermal effects. Numerical results are compared with experimental measurements for validation.

Keywords: Stator bar, finite element method, multiphysics analysis, hydro-generator

DOI: 10.3233/JAE-200012

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-14, 2020

Authors: Wang, Tingting | Zheng, Changbao | Zhou, Rui | Wang, Qunjing | Ju, Lufeng | He, Jingxiong

Article Type: Research Article

Abstract: The magnetic field and torque of permanent-magnetic spherical motor (PMSpM) are difficult to analyze due to the complicated structure, and therefore are often analyzed by the finite-element method (FEM) or Lorentz force method, with large amount of calculation and time consumption. This paper first establishes a three-dimensional (3-D) magnetic field analytical model of a spherical motor with permanent magnets (PMs) by the equivalent surface current method. Secondly, through the Lorentz force spatial integration of energized stator coil, a torque analytical model is established. Thirdly, in order to avoid repeated integration operation, a torque interpolation model based on torque Map is …established. Both magnetic field and torque analytical models are verified by comparing with FEM and the experiment respectively. It is shown that the method proposed not only ensures the modeling accuracy but also significantly speeds up the analysis. Show more

Keywords: Permanent-magnet spherical motor (PMSpM), Lorentz force method, Torque modeling, Interpolation calculation

DOI: 10.3233/JAE-201538

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-18, 2020

Authors: Chen, Dezhi | Diao, Chengwu | Feng, Zhiyu | Zhang, Shichong | Zhao, Wenliang

Article Type: Research Article

Abstract: In this paper, a novel dual-stator permanent magnet machine (DsPmSynM) with low cost and high torque density is designed. The winding part of the DsPmSynM adopts phase-group concentrated-coil windings, and the permanent magnets are arranged by spoke-type. Firstly, the winding structure reduces the amount of copper at the end of the winding. Secondly, the electromagnetic torque ripple of DsPmSynM is suppressed by reducing the cogging torque. Furthermore, the dynamic performance of DsPmSynM is studied. Finally, the experimental results are compared with the simulation results.

Keywords: Dual stator, spoke-type, cogging torque, phase-group concentrated-coil windings

DOI: 10.3233/JAE-209457

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-9, 2020

Authors: Deri, Yi | Kawaguchi, Hideki

Article Type: Research Article

Abstract: The Pure-type HTS undulator is proposed to achieve a high-intensity magnetic field and small size undulator for a compact free-electron laser (FEL). A high precision simulation is required before making the real machine since the sizes and positions are difficult to adjust after the HTSs are magnetized in the cryostat. For this purpose, authors have been developed a numerical simulation code for the magnetization process of HTS undulator of X-FEL based on the power-law macro-model. In this paper, the previously developed simulation code can be speeded up by carefully optimizing the parameters of the power-law macro-model for the 3-HTS magnets …model and a large-scale simulation can be performed in an acceptable time by using a multipole expansion for the Biot–Savart law. In addition, for practical applications, the influence of the fluctuation of the magnets thickness and critical current for the electron trajectory are evaluated by using the speed-up simulation code. Show more

Keywords: Undulators, X-ray free-electron laser (X-FEL), power-law macro-model, multipole expansion, current vector potential method (T-method)

DOI: 10.3233/JAE-209413

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-7, 2020

Authors: Zhang, Wenguang | Yin, Xuele | Xie, Jie | Ma, Yakun | Li, Zhengwei

Article Type: Research Article

Abstract: In order to develop long-lifetime neural electrodes, the insertion tissue injury caused by two optimized neural electrode (convex streamline electrode and vibration attenuation electrode) models were evaluated compared with a reference electrode. Based on the experimental evaluation system for testing tissue injury, the effects of insertion speeds on tissue injury of the two optimized electrodes with different insertion depths were studied. The maximum tissue strain caused by the two optimized neural electrodes firstly increased and then decreased with the increase of insertion speed at the depths of 3 mm and 4.5 mm. The insertion forces caused by vibration attenuation electrode are steady …with the change of insertion speed. The convex streamline neural electrode caused less tissue injury compared with the other two electrodes. The higher or lower insertion speed causes smaller tissue strain for the two optimized electrodes, which is conductive to set implantation parameters to minimize tissue injury. Show more

Keywords: Neural electrode, comparative experiment, insertion parameters, tissue injury, optimal design

DOI: 10.3233/JAE-209459

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-9, 2020

Authors: Ngouala, Benhy | Liu, Fang | Xu, Jia | Zhu, Zhi-Wen

Article Type: Research Article

Abstract: A novel magnetic shape memory alloy (MSMA) actuator is proposed in this paper, which has fast response speed and large deformation, and its nonlinear dynamic response and control are studied. A new differential term is developed to explain the MSMA’s stress-strain curves. The dynamic model of the MSMA actuator subjected to harmonic magnetic field and random disturbance is established, and its nonlinear dynamic characteristics are obtained. Finally, the stochastic dynamic programming control is introduced to enhance the drive accuracy. The results show that the perturbation plays an important role in the system’s dynamic response; dynamic programming control can improve the …actuator’s accuracy in strong stochastic perturbation. These results will be helpful for the optimal design and development of MSMA actuators. Show more

Keywords: Magnetic shape memory alloy (MSMA), stochastic excitation, actuator, stochastic optimal control

DOI: 10.3233/JAE-209473

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-7, 2020

Authors: Liu, Dandan | Ma, Wu | Wang, Jie | Liu, Chongzhi | Tang, Chunrui

Article Type: Research Article

Abstract: The particle movement speed in the pipe of an existing dust measuring device is too small, and the detection in the center area of the pipe is not sufficiently sensitive. According to the intake mode of the cyclone separator, here a new side inlet pipeline is designed that is oriented from the incident mode of the straight pipe. An experimental model was established in Gambit2.4, and the numerical simulation was performed in Fluent6.3. Different dust particle diameters were simulated, and velocity cloud and pressure cloud diagrams of the middle position of the device pipe were obtained. Compared with the velocity …data of the straight tube and the side tube, the velocity value of the particle passing through the side tube was better than that of the straight tube. This improved the velocity of the particles and also reduced the settling of the particles. The probability of friction collision of the dust particles in the tube increased, meaning that their induced charge also increased. MATLAB was used to calculate the electrostatic induction, revealing that the charge of the particles in the improved device increased significantly. Therefore, the improved device can effectively improve the measurement accuracy of dust at low concentrations, and for small particle sizes. Show more

Keywords: Dust measurement, electrostatic induction, side inlet pipe, rotating attachment wall, data comparison

DOI: 10.3233/JAE-209376

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Zhang, Zhifeng | Wu, Yue | Ye, Sicong

Article Type: Research Article

Abstract: Recently, the interest in model predictive control (MPC) and dual three-phase drives has been growing rapidly. Due to the high redundancy of voltage vector in the system composed of dual three-phase permanent magnetic synchronous motor (PMSM) and six-phase inverter, the computational complexity and current harmonics of MPC are high. In addition, the zero vector has been used by traditional MPC, which will cause higher common-mode voltage. In this paper, a novel MPC method with twice predictions and synthetic vectors is proposed which can not only suppress common-mode voltage, but also reduce computational complexity and current harmonics. The mathematical model of …a dual three-phase PMSM are verified by the experimental results under the common-mode voltage suppression. Show more

Keywords: Model predictive control, dual three-phase PMSM, common-mode voltage, synthetic vectors

DOI: 10.3233/JAE-209465

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Zhou, Xinwu | Urayama, Ryoichi | Uchimoto, Tetsuya | Takagi, Toshiyuki

Article Type: Research Article

Abstract: Eddy current testing is widely used for the automatic detection of defects in conductive materials. However, this method is strongly affected by probe scanning conditions and requires signal analysis to be carried out by experienced inspectors. In this study, back-propagation neural networks were used to predict the depth and length of unknown slits by analyzing eddy current signals in the presence of noise caused by probe lift-off and tilting. The constructed neural networks were shown to predict the depth and length of defects with relative errors of 4.6% and 6.2%, respectively.

Keywords: Eddy current testing, artificial intelligence, back-propagation neural network

DOI: 10.3233/JAE-209394

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-9, 2020

Authors: Huang, Haiyang | Wang, Cheng | Lai, Xiongming | Chen, Jianwei

Article Type: Research Article

Abstract: In order to select the window function and window size adaptively before getting the results, we proposed adaptive moving window principle component analysis (AMWPCA) based OMA method to identify modal shapes and modal natural frequencies of slow LTV structures with weekly damped only from non-stationary vibration response signal online. The adaptive is achieved in two ways: change the window function or window size. We develop an adaptive indicator as the basis for window function and window size changes Our adaptive approach is to make the difference between adjacent eigenvalues not too small. The operational modal parameter identification results in non-stationarity …response signal dataset of a three-degree-of-freedom structure with slow time-varying mass show that comparing with fixed size moving window principle component analysis, our AMWPCA method can identify the modal shapes and modal frequencies better. Show more

Keywords: Moving window, adaptive, window function, linear time-varying structure, operational modal analysis, principle component analysis

DOI: 10.3233/JAE-209359

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Chen, Dezhi | Diao, Chengwu | Feng, Zhiyu | Zhang, Shichong | Zhao, Wenliang

Article Type: Research Article

Abstract: This paper presents the performance of vector modulation technology in the open-winding permanent magnet synchronous motor (OW-PMSM) considering the unity power factor control. And a topology structure is proposed to optimize the fault tolerance of inverter. Matlab software and Maxwell software collaborative simulation are supplied to obtain the reactive power, speed, terminal voltage, electromagnetic torque etc. under normal and fault status. Finally, the simulation results of an open-winding permanent magnet synchronous motor are verified by the experimental results.

Keywords: Open-winding permanent magnet synchronous motor, fault tolerance, unity power factor control

DOI: 10.3233/JAE-209448

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-9, 2020

Authors: Okobira, Tatsuya | Nguyen, Dang-Trang | Taguchi, Kozo

Article Type: Research Article

Abstract: Many efforts have been devoted to the improvement of metal-air batteries. Aluminum (Al) is the most abundant metal in the Earth’s crust and has high electrochemical potential. Therefore, the aluminum-air battery is one of the most attractive metal-air batteries. To overcome some disadvantages of the aluminum-air battery, some alloys of aluminum and several metals have been proposed. In this study, the performance improvement of the aluminum-air battery by doping zinc (Zn) to the aluminum anode was investigated. Zinc was doped to aluminum by a simple process. The difference in the characteristics of Zn-doped Al due to different heating temperature during …the doping process was also investigated. The maximum power density of the battery was 2.5 mW/cm2 . Show more

Keywords: Aluminum-air battery, dope, zinc, simple method, ozone treatment

DOI: 10.3233/JAE-209307

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Nagai, Hiroshi | Okuyama, Takeshi | Tanaka, Mami

Article Type: Research Article

Abstract: In this paper, an active tactile sensor system for measurement of Young’s modulus and viscosity is developed. For the active sensing, the sensor unit with the 8 bimorph piezoelectric array is bonded to the speaker that is driven by a square wave. The transient response from the sensor signal of each bimorph piezo cell is processed to reduce the noise. From the output, the first peak and the ratio of first peak to time of first peak are extracted as the indexes for the measurement of Young’s modulus and viscosity, respectively. It is confirmed that the first peak has a …clear correlation with the Young’s modulus, and that the ratio of first peak to time of first peak has a definite correlation with the viscosity. Further, the initial contact force affects the sensitivities of Young’s modulus and viscosity. Show more

Keywords: Tactile sensor, piezoelectric bimorph array, active sensing, measurement of Young’s modulus and viscosity

DOI: 10.3233/JAE-209426

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Yan, Gang | Zheng, Yifei

Article Type: Research Article

Abstract: This paper proposes a new printed electrical impedance tomography (EIT) sensor for detection of damage in composite structure. The EIT sensor consists of a sensing area and related electrical circuits. It is directly printed on the surface of composite structure by a layer-by-layer screen printing process with graphene-doped carbon ink and silver ink. By injecting tiny currents into the EIT sensor and measuring the corresponding boundary voltages, damage information can be obtained by inverse analysis to reconstruct the distribution of conductivity change caused by damage. It has the potential to quantitatively identify the locations and sizes of multiple damage without …any prior knowledge. Experimental results on a glass fiber reinforced polymer (GFRP) plate with different number of simulated damage have demonstrated the effectiveness of the printed sensor itself and the related damage detection method. Show more

Keywords: Composite structure, damage detection, printed sensor, electrical impedance tomography, inverse analysis

DOI: 10.3233/JAE-209416

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-7, 2020

Authors: Wang, Xiang | Wang, Xiaoyu | Chai, Hongyou | Gao, Feng | Wang, Haowei | Ji, Hongli | Qiu, Jinhao

Article Type: Research Article

Abstract: In order to suppress the vibration of large-scale flexible structures which are applied on the spacecraft, a semi-active control method based on fuzzy adaptive SSDV (synchronized switch damping on voltage) technique is proposed. The value of voltage source at the switching moment is adjusted adaptively by using fuzzy logic, in order to improve the stability and control precision of the semi-active control system. The feasibility of this method is verified by two kinds of experiments with typical disturbance conditions. By comparing different adaptive displacement-voltage curves, the fuzzy adaptive method can achieve higher control precision. For the initial displacement disturbance of …10 mm, the fuzzy adaptive SSDV method can increase the system damping ratio from 0.6% to 5.1%. The control effect decreases with the increase of initial displacement. For the disturbance caused by the mechanism at the tip position, the method can effectively shorten the vibration damping time and reduce the displacement from 0.3 mm to 0.04 mm. Show more

Keywords: Large-scale flexible structure, semi-active control, synchronized switch damping technique, fuzzy logic

DOI: 10.3233/JAE-209437

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Otani, Shu | Nguyen, Dang-Trang | Taguchi, Kozo

Article Type: Research Article

Abstract: In this study, a portable and disposable paper-based microbial fuel cell (MFC) was fabricated. The MFC was powered by Rhodopseudomonas palustris bacteria (R. palustris ). An activated carbon sheet-based anode pre-loaded organic matter (starch) and R. palustris was used. By using starch in the anode, R. palustris -loaded on the anode could be preserved for a long time in dry conditions. The MFC could generate electricity on-demand activated by adding water to the anode. The activated carbon sheet anode was treated by UV-ozone treatment to remove impurities and to improve its hydrophilicity before being loaded with R. palustris . The developed …MFC could generate the maximum power density of 0.9 μW/cm2 and could be preserved for long-term usage with little performance degradation (10% after four weeks). Show more

Keywords: Paper-based MFC, Rhodopseudomonas palustris , UV-ozone cleaning, biofilm, bio-anode

DOI: 10.3233/JAE-209444

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Dong, Ting | Dong, Xingkang | Wei, Xuepeng

Article Type: Research Article

Abstract: Thrust performance is one of the important indexes of permanent magnet linear synchronous motors. The traditional non-oriented silicon steel sheet is used as the core material of the permanent magnet linear synchronous motor, which limits the performance of the permanent magnet linear synchronous motors. For the oriented silicon steel sheet has a higher magnetic permeability in the rolling direction, a permanent magnet linear synchronous motor with similar number of pole and slot made of oriented silicon steel is proposed in this paper. By measuring the B -H curves of the rolling direction and the cutting direction, the thrust properties …of the two motors made of traditional silicon steel sheets and oriented silicon steel sheets are analyzed and compared by the finite element method (FEM) under rated load and overload conditions respectively. The thrusts under different tooth-yoke ratio are discussed in the end. Show more

Keywords: Thrust, oriented silicon steel, PMLSMs, similar number of poles and slots

DOI: 10.3233/JAE-209472

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Chen, Dezhi | Zhang, Yuyong | Yao, Hang | Wang, Yang | Zhao, Wenliang

Article Type: Research Article

Abstract: In this paper, the magnetic field and temperature field of transformer are analyzed, and the influence of temperature on electrical steel sheet is considered. Experiment are supplied to obtain the magnetic properties curves (B-H curves, B-P curves, and magnetic permeability curves of 30QG120), which are required for the accurate FEM (finite element method) simulation setup. Finally, the magnetizing characteristics and temperature distribution of the transformer under different temperatures and loads are studied experimentally. The simulation results of a singlephase transformer are verified by the experimental results.

Keywords: Electrical steel sheet, different temperature magnetizing characteristics, transformer, simulation and experiment

DOI: 10.3233/JAE-209388

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-9, 2020

Authors: Wimmer, Georg | Lange, Sebastian

Article Type: Research Article

Abstract: The formulation for the azimuthal component of the magnetic vector potential for axisymmetric magnetostatic applications is well known. However for transient magnetic fields with solid source conductors and eddy currents the formulation has to be revised. A variable transformation is introduced to remove the singularity from the numerical scheme. The numerical error cannot accumulate and is put instead to the postprocessing at every time step.

Keywords: Transient magnetic, finite element method, numerical error

DOI: 10.3233/JAE-209475

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-7, 2020

Authors: Narita, Takayoshi | Oda, Yoshiho | Ito, Yasuaki | Kato, Hideaki

Article Type: Research Article

Abstract: The grasping and conveying of an object by utilizing the frictional force generated by contact are performed during various steps in the process of manufacturing industrial products. Deterioration of the surface quality due to these contacts is a problem. A noncontact way to transport steel plates using electromagnetic force has been proposed as a solution to these problems. In such applications to date, electromagnets are installed in the vertical direction. However, if the steel plate is thin and lacks sufficient flexural rigidity, it is difficult to exert enough suspension force to levitate the entire steel plate. To solve this problem, …we propose an edge-supported electromagnetic levitation system suitable for flexible steel plates using electromagnets installed in the horizontal direction. In this paper, we report on levitation experiments to verify the effectiveness of the proposed system and discuss characteristics of the horizontal positioning of electromagnets and levitation suspension. Show more

Keywords: Electromagnetic levitation, metal foil, noncontact support

DOI: 10.3233/JAE-209436

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Zhang, Wenguang | Li, Wei | Sun, Xiaowen

Article Type: Research Article

Abstract: In order to improve the electrochemical performance of the neural electrode the polyaniline coatings were modified on roughened Pt (PANI/rPt1 ) electrodes using electrochemical method. The roughness factor (f R up to 424) of Pt surfaces increased significantly through electrochemical roughening processing. PANI/rPt electrodes showed excellent interfacial properties. Specifically, about 5.6-fold increase in the charge density of PANI/rPt (f R = 424) was observed, while the interfacial impedance (103.5 Ω) was reduced by 50% compared to that of PANI coatings on the smooth Pt surfaces (PANI/sPt2 ). The results indicate the potential application of PANI/rPt as …an efficient and stable future neural interface. In addition, the wear test shows that the coating did not fail during the wearing period and holds an excellent wear resistance ability. Show more

Keywords: Electrochemical roughening, polyaniline, electrochemical properties, anti-wear performance

DOI: 10.3233/JAE-209468

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-7, 2020

Authors: Li, Jianqi | Zhou, Yu | Li, Jianying

Article Type: Research Article

Abstract: This paper presented a novel analytical method for calculating magnetic field in the slotted air gap of spoke-type permanent-magnet machines using conformal mapping. Firstly, flux density without slots and complex relative air-gap permeance of slotted air gap are derived from conformal transformation separately. Secondly, they are combined in order to obtain normalized flux density taking account into the slots effect. The finite element (FE) results confirmed the validity of the analytical method for predicting magnetic field and back electromotive force (BEMF) in the slotted air gap of spoke-type permanent-magnet machines. In comparison with FE result, the analytical solution yields higher …peak value of cogging torque. Show more

Keywords: Magnetic field, permanent-magnet machines, conformal transformation, spoke-type, slots

DOI: 10.3233/JAE-201505

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-15, 2020

Authors: Uchino, Daigo | Liu, Xiaojun | Kato, Hideaki | Narita, Takayoshi

Article Type: Research Article

Abstract: Ultra-compact electric vehicles have excellent environmental performance and are extremely convenient for short-distance travel. However, owing to cabin space limitations, it is difficult to mount power steering. Therefore, there is a need to increase the gear ratio of the rack and pinion to change steering angle because such vehicles need light torque to steer. However, increasing the gear ratio requires more rotations of the steering wheel. Our research group focused on developing a steer-by-wire system (SBWS) that freely controls the steering torque. Although we evaluated the burden when a driver rotates the steering wheel in one direction in a previous …study. This study assumed the actual steering operation in an SBWS. And then we evaluate muscle burden when a driver steers with continuous changing of the steering direction. Show more

Keywords: Steer-by-wire system, ultra-compact electric vehicle, self-aligning torque, surface electromyography (EMG), muscle burden on driver

DOI: 10.3233/JAE-209427

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Chen, Delei | Wang, Cheng | Lai, Xiongming | Zhang, Huizhen | Li, Haibo | Chen, Jianwei

Article Type: Research Article

Abstract: In order to reduce the influence of ill-posed inverse on response prediction in the situation of unknown uncorrelated multiple sources load, a response prediction method based on elastic-net regularization in the frequency domain was proposed. This method utilized the linear relationship between known responses and the unknown responses instead of the transfer function to predict the response. Moreover, the elastic-net regularization model has two regularization parameters combining l1, l2 regularization to reduce the influence of ill-posed inverse. The experiment results on the data of acoustic and vibration sources on cylindrical shells showed that the elastic-net regularization in predicting response could …obtain higher accurate results compared with the method of transfer function and the method of ordinary least squares, and predict vibration response effectively and satisfy industrial requirements. Show more

Keywords: Multi-point vibration response prediction, elastic-net regularization, ill-posed, ordinary least squares

DOI: 10.3233/JAE-209375

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-9, 2020

Authors: Tsuji, Yuhei | Nguyen, Dang-Trang | Taguchi, Kozo

Article Type: Research Article

Abstract: This study focused on investigating low-cost but high-performance catalyst materials used for the air cathode of the aluminum-air battery. Nickel, in the form of Ni(OH)2 , was used as the catalyst because it is abundant and low-cost. The activated carbon sheet was used as the substrate to load the catalyst. The solvothermal synthesis method was used to synthesize the catalyst. The advantage of the solvothermal method is that the particle size can be reduced under high temperature and pressure conditions. The operation of some types of air-cathodes was examined. UV-ozone treatment of the air-cathode has also been investigated to enhance …the performance of the battery. Show more

Keywords: Air cathode, Nickel hydroxide, metal-air battery, UV-ozone cleaning

DOI: 10.3233/JAE-209308

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-7, 2020

Authors: Wang, Minghui | Yu, Hongliu

Article Type: Research Article

Abstract: Fecal incontinence caused by sphincter dysfunction is an unresolved problem which has a serious effect on patients, both physically and psychologically. For patients with severe symptoms, treatment with an artificial anal sphincter could be a potential option to restore continence. Acticon Neosphincter still has safety and efficacy problems, which is the only device certified by the US Food and Drug Administration. The biomechanical compatibility is the key problem of artificial anal sphincter in the clinical application. This paper describes an artificial anal sphincter with superelastic shape memory alloys and its mechanical properties assessment in artificial intestine models. The new design …was developed as a low invasive and constant force or pressure prosthesis with a simple structure to solve the problem of severe fecal incontinence in patients. Show more

Keywords: Fecal incontinence, artificial anal sphincter, constant force, shape memory alloys, superelastic

DOI: 10.3233/JAE-209435

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Wang, Minghui | Yu, Hongliu

Article Type: Research Article

Abstract: Clamping devices with constant force or pressure are desired in medical device, such as hemostatic forceps and the artificial sphincter, to prevent soft tissues from injures due to overloading. It is easily obtained by stretching an SMA wire. However, studies with SMA bending round bar have seldom been reported before. This paper studied constant force characteristic of C-shaped round bar with shape memory alloys. Optimization designs of the components were carried out with computational simulation. Numerical results show that the phenomenon of constant force strongly depends on contour curve shape and geometric dimensions of the C-shaped round bar of SMA …component. Show more

Keywords: Constant force, shape memory alloys, superelastic

DOI: 10.3233/JAE-209443

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-7, 2020

Authors: Kikuchi, Hiroaki | Sato, Yuki

Article Type: Research Article

Abstract: We investigated effects of contact gap on magnetic nondestructive evaluation technique using a magnetic single-yoke probe. Firstly, we evaluated hysteresis curves and impedance related to permeability of the material measured by a single-yoke probe, when an air gap length between the probe and specimens changes. The hysteresis curve gradually inclines to the axis of the magneto-motive force and magneto-motive force at which the magnetic flux is 0 decreases with increasing the gap length. The effective permeability also decreases with increasing the gap thickness. The incremental of gap thickness increases the reluctance inside the magnetic circuit composed of the yoke, specimen …and gap, which results in the reduction of flux applying to specimen. Show more

Keywords: Magnetic NDE, magnetic yoke probe, contact gap, coercive field, permeability, impedance, magneto-motive force

DOI: 10.3233/JAE-209411

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-7, 2020

Authors: Hosokawa, Hiroyuki | Hirata, Katsuhiro | Niguchi, Noboru

Article Type: Research Article

Abstract: We propose a non-contact electromagnetic impact-torque device (EMI device) using induced currents, and its characteristics have been verified using 3-D finite element method (FEM) analysis and carrying out measurements on a prototype. This paper describes a new EMI device with a regenerative circuit. A boosting chopper circuit is connected to the proposed EMI device, and the impact torque is controlled using the regenerated power.

Keywords: Electromagnetic impact-torque device, boosting circuit, finite element method

DOI: 10.3233/JAE-209431

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-10, 2020

Authors: Kato, Hirohisa | Komori, Mochimitsu | Asami, Ken-ichi | Sakai, Nobuo

Article Type: Research Article

Abstract: In this paper, a centrifugal pump for for extremely low temperature was fabricated and evaluated by experiments in liquid nitrogen. The pump is using a bearingless motor and permanent magnet bearings to levitate and rotate the rotor without lubricating oil. The difference from the conventional study is that a one-axis controlled bearingless motor is used to reduce the magnetic bearing cost and that the bearings are installed in the liquid to eliminate a shaft-seal. Stable levitation and rotation of the rotor were confirmed in the rotation and pump experiments in liquid nitrogen. In pump experiment, the flow rate of liquid …nitrogen was measured at 1 cm in a pumping height. The maximum flow rate was 1.3 L/min when the rotation speed is 1,800 rpm. Show more

Keywords: Magnetic bearing, bearingless motor, centrifugal pump, low temperature, actuator

DOI: 10.3233/JAE-209447

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Chen, Tao | Xiao, Xiaoqi | Zhang, Lihong | Lv, Cheng | Deng, Zhiyang | Song, Xiaochun

Article Type: Research Article

Abstract: Due to uneven surface and lift-off effect, it is difficult to detect weld crack by eddy-current testing. A new orthogonal eddy-current probe for weld crack detection of carbon-steel plate was designed in this paper. Based on COMSOL Multiphysics, the influence of scanning angle on detection sensitivity of the probe was compared firstly. Then, the effects of coil width, coil side length, detection coil height, and lift-off distance on detection sensitivity of the probe were studied, respectively. Finally, the test piece of carbon-steel plate weld with crack, and the physical probe used to verify the crack detection effect were made. The …experimental results show that the weld crack of carbon-steel plate with length × width × depth of 20.0 mm × 0.3 mm × 1 mm can be effectively identified, and the lift-off noise can be effectively suppressed by the method presented in this paper. At the same time, the signal-to-noise ratio of the probe keeps constant in the lift-off distance range of 0.3 mm–3.0 mm. Show more

Keywords: Orthogonal eddy-current probe, carbon-steel weld, nondestructive testing, COMSOL multiphysics

DOI: 10.3233/JAE-209453

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-9, 2020

Authors: Wang, Li | Chen, Zhenmao

Article Type: Research Article

Abstract: In the nondestructive evaluation for components of key equipment, sizing of natural crack is important in order to guarantee both the safety and efficient operation for large mechanical systems. Natural cracks have complex boundary and there may be electric current flowing through crack faces. If a simple model of artificial notch is used to simulate it, errors often occur in crack depth reconstruction from eddy current testing (ECT) signals. However, if a complex crack conductivity model is used, quantitative evaluation of natural crack will be transformed into a multivariable nonlinear optimization problem and the solution is difficult. In this paper, …based on the relationship between crack parameters and features of multi-frequency ECT signals, a multi-output support vector regression algorithm using domain decomposition for parameters was proposed The algorithm realized the quantitative evaluation of multiple parameters of crack in turn. Numerical examples with simulated and measured ECT signals were presented to verify the efficiency of the proposed strategy. Show more

Keywords: Quantitative evaluation, natural crack, eddy current testing, support vector regression, multivariable output

DOI: 10.3233/JAE-209383

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Sato, Hayaho | Maruo, Akito | Igarashi, Hajime

Article Type: Research Article

Abstract: This paper presents the three-dimensional modeling of soft magnetic composite (SMC) based on the discrete element method. The proposed method makes it possible to take the possible contact among the magnetic particles in SMC as well as the distributed particle size into consideration. Based on this modeling, the macroscopic B -H characteristics is computed with the finite element method considering magnetic saturation. It is shown that the three-dimensional model of SMC can have larger initial permeability in comparison with the two-dimensional model even if they have the same filling factor.

Keywords: Discrete element method, homogenization method, soft magnetic composite

DOI: 10.3233/JAE-209355

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-10, 2020

Authors: Chen, Yuanyuan | Jin, Wuyin | Wang, Meng

Article Type: Research Article

Abstract: A novel deep learning segmentation method based on Conditional Generative Adversarial Nets (CGAN) is proposed, being U-GAN in this paper to overtake shortcomings of the metallographic images of GCr15 bearing steel, such as multi-noise, low contrast and difficult to segment. The results of experiment indicate that the proposed model is the most accurate comparing with the digital image processing methods and deep learning methods on carbide particle segmentation. The average Dice’s coefficient of similarity measure function is 0.9158, which is the state-of-the-art performance on dataset.

Keywords: Metallographic image, image processing, carbide particle segmentation, deep learning, CGAN

DOI: 10.3233/JAE-209441

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-7, 2020

Authors: Xu, Fangchao | Guo, Yongquan | Zhou, Ran | Jin, Junjie | Zhao, Chuan | Zhang, Xiaoyou | Sun, Feng

Article Type: Research Article

Abstract: To solve the problem of reduction of suspension force of permanent magnet system with variable magnetic flux path control, according to the structure of the system, suspension principle of the permanent magnet system with variable magnetic flux path control and the generation principle of the load torque, the influence of the mechanical structure of the system on the suspension force is analyzed by changing part of parameters of the system structure. The results show that the existence of magnetic isolation plate is the main reason for the decrease of suspension force, the permanent magnet ring can be thickened to 11.91 mm, …the annular gap can be reduced to 1 mm, thickness of the “F” shaped magnetizer can be increased to 9 mm to increase the suspension force. Show more

Keywords: Magnet system, variable magnetic flux path, analysis of structure factor

DOI: 10.3233/JAE-209470

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-10, 2020

Authors: Dong, Yangyang | Zuo, Kungang | Han, Shaojie | Zhang, Zijian

Article Type: Research Article

Abstract: Piezoelectric Stack Actuators (PEAs) have been widely used in high-precision positioning system because of its fast response. However, under different excitation voltages and external loads with dynamic frequencies, the width and inclination of PEAs hysteresis curves verified correspondingly, and exhibit asymmetry phenomenon. The main contribution of this paper is to present a two-input asymmetric dynamic cross-coupled hysteresis (TADCH) model to describe the complex nonlinear hysteresis of PEAs in dynamic excitation and loading engineering applications. Moreover, we also develop the corresponding identification method of TADCH model. Finally, several experiments are carried out to verify the accuracy of the proposed model.

Keywords: Prandtl–Ishlinskii hysteresis, two-input dynamic cross-coupled asymmetric hysteresis

DOI: 10.3233/JAE-209469

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-9, 2020

Authors: Ito, Yasuaki | Oda, Yoshiho | Kato, Taro | Liu, Xiaojun | Endo, Ayato | Ikeda, Keigo | Narita, Takayoshi | Kato, Hideaki

Article Type: Research Article

Abstract: Thin steel plates are widely used in various industrial products. However, because of the deterioration of surface quality and metal plating that occurs during transport, some problems exist. As a solution to these problems, a noncontact transport of steel plate using electromagnetic force has been proposed. However, side slip or the dropping of the plate may occur. Therefore, we proposed the addition of electromagnetic actuators to control the horizontal motion of levitated steel plates. In this study, we examined the change in the levitation stability during noncontact transport with the addition of positioning control in the horizontal direction or changed …transport conditions. As a result, the application of a magnetic field in the horizontal direction improved the levitation stability of transported thin steel plates in different transport conditions. Show more

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

DOI: 10.3233/JAE-209369

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-9, 2020

Authors: Lee, Sung-hyun | Baloch, Noman | Kwo, Byung-il

Article Type: Research Article

Abstract: This paper proposes a double consequent pole changing vernier machine (DCPCVM) which adopts double consequent pole and flux modulation configuration. The proposed machine combines a vernier machine and a permanent magnet synchronous machine (PMSM) in a single topology. Therefore, the advantages of both machines can be realized in a single topology. The proposed machine provides high torque at low speed while operating in vernier mode whereas it operates in PMSM mode at high speed to avoid the disadvantages of vernier machines at high speeds such as high core losses. Parametric analysis of the proposed machine is performed to show the …effect of the main variables on the electromagnetic characteristics of the machine. A finite element method (FEM) analysis is conducted, and meaningful conclusions are drawn. Show more

Keywords: DCPCVM, pole changing, vernier machine, PMSM, parametric analysis

DOI: 10.3233/JAE-209408

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-9, 2020

Authors: Ren, Shuting | Li, Yong | Yan, Bei | Hu, Jinhua | Zainal Abidin, Ilham Mukriz | Chen, Hongen

Article Type: Research Article

Abstract: Structures of nonmagnetic materials are broadly used in engineering fields such as aerospace, energy, etc. Due to corrosive and hostile environments, they are vulnerable to the Subsurface Pitting Corrosion (SPC) leading to structural failure. Therefore, it is imperative to conduct periodical inspection and comprehensive evaluation of SPC using reliable nondestructive evaluation techniques. Extended from the conventional Pulsed eddy current method (PEC), Gradient-field Pulsed Eddy Current technique (GPEC) has been proposed and found to be advantageous over PEC in terms of enhanced inspection sensitivity and accuracy in evaluation and imaging of subsurface defects in nonmagnetic conductors. In this paper two GPEC …probes for uniform field excitation are intensively analyzed and compared. Their capabilities in SPC evaluation and imaging are explored through simulations and experiments. The optimal position for deployment of the magnetic field sensor is determined by scrutinizing the field uniformity and inspection sensitivity to SPC based on finite element simulations. After the optimal probe structure is chosen, quantitative evaluation and imaging of SPC are investigated. Signal/image processing algorithms for SPC evaluation are proposed. Through simulations and experiments, it has been found that the T-shaped probe together with the proposed processing algorithms is advantageous and preferable for profile recognition and depth evaluation of SPC. Show more

Keywords: Electromagnetic nondestructive evaluation, gradient-field pulsed eddy current inspection, subsurface pitting corrosion, corrosion imaging, signal/image processing

DOI: 10.3233/JAE-209303

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-11, 2020

Authors: Ayub, Muhammad | Hussain, Asif | Sirewal, Ghulam Jawad | Kwon, Byung-il

Article Type: Research Article

Abstract: This manuscript proposes a wye-delta winding configuration for brushless operation of a wound field synchronous machine (BL-WFSM). In existing third harmonically excited BL-WFSM topologies, the additional third harmonic component of the stator magnetomotive force (MMF) was produced by an extra thyristor drive circuit or by utilizing an additional inverter. In the proposed single inverter topology, the stator winding is divided into two coil sets: the wye coil and delta coil. Triplen harmonic currents are produced owing to the delta coils set and start to circulate in the delta coils. This triplen harmonic circulating currents produce a triplen harmonic pulsating MMF …in the airgap. The additional triplen harmonic pulsating MMF induces voltage in the rotor harmonic winding. This induced voltage in the harmonic winding is used to excite the rotor field. A 2D finite element analysis is performed, and the simulation results confirmed the operation principle of the proposed brushless topology. Show more

Keywords: Brushless, delta coils, MMF, triplen harmonic, wye coils, WFSM

DOI: 10.3233/JAE-209433

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Sasaki, Ryunosuke | Koizumi, Kohei | Kiryu, Shogo

Article Type: Research Article

Abstract: In this study, a magnetic resonance wireless power transmission system with a sown auxiliary coil is described. The system is proposed to deliver power to an “implantable cardioverter defibrillator” (ICD) device from a bed. The auxiliary coil is supposed to be sown in a shirt. With the coil, the poor coupling coefficient and the effective quality factor can be improved. In this study, the power efficiency was investigated on a magnetic resonance wireless power transmission system with a sown auxiliary coil by using a 1/2 scaled model. As a result, when transfer distance was 100 mm (200 mm in the full scaled …model) and lord resistance was 20 Ω, the maximum transfer efficiency with an auxiliary coil was measured to be about 70% much higher than without that. Show more

Keywords: Wireless power transmission, sown coil, magnetic resonance

DOI: 10.3233/JAE-209397

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-9, 2020

Authors: Liu, Tianhao | Jin, Yu | Pei, Cuixiang | Han, Jie | Chen, Zhenmao

Article Type: Research Article

Abstract: Small-diameter tubes that are widely used in petroleum industries and power plants experience corrosion during long-term services. In this paper, a compact inserted guided-wave EMAT with a pulsed electromagnet is proposed for small-diameter tube inspection. The proposed transducer is noncontact, compact with high signal-to-noise ratio and unattractive to ferromagnetic tubes The proposed EMAT is designed with coils-only configuration, which consists of a pulsed electromagnet and a meander pulser/receiver coil. Both the numerical simulation and experimental results validate its feasibility on generating and receiving L(0,2) mode guided wave. The parameters for driving the proposed EMAT are optimized by performance testing. Finally, …feasibility on quantification evaluation for corrosion defects was verified by experiments. Show more

Keywords: Guided wave, EMAT, pulsed electromagnet, tube inspection

DOI: 10.3233/JAE-209409

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Xia, Hui | Li, Erlong | Wu, Jianbo | Qiu, Qiao | Wang, Jie | Luo, Jiqing | He, Sha

Article Type: Research Article

Abstract: Pulsed eddy current thermography (PECT) and eddy current lock-in thermography (ECLIT) are non-destructive testing (NDT) techniques of high promising and interest in subsurface defect detection. In the previous researches, the induction coil was set above the defect region and it always parallel to the defect orientation. However, the location and orientation of subsurface defects cannot be determined before detection. Therefore, the scanning induction thermography (SIT) based on dynamic thermography is proposed by some researchers to localize and distinguish the subsurface defects. Still, the main challenges of SIT are how to detect the subsurface defect orientation and quantify the depth. So …that, the quantitative analysis in SIT with the new feature extraction methods was investigated and improved to detect the subsurface defect orientation and quantify the defect depth within 5 mm by using experimental studies. Show more

Keywords: Scanning induction thermography, max thermal response, fast Fourier transform, defect orientation detection, depth quantification

DOI: 10.3233/JAE-209400

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-9, 2020

Authors: Liu, Chengyong | Li, Erlong | Wang, Shiqiang | Wu, Jianbo | Fang, Hui | He, Sha

Article Type: Research Article

Abstract: Magnetic Barkhausen Noise (MBN) detection technology shows great potential in the pipeline detection of stress, microstructure, and fatigue damage. However, in actual application, some pipes such as those near power plant are exposed to external magnetic fields or contain remanence. The presence of these magnetic fields will affect MBN features and then influence the testing results. To investigate the effect of DC magnetic field on MBN signal characteristics, theoretical analysis and experimental verification were carried out in this paper. It is found that the intensity and direction of the DC magnetic field have great effects on MBN signal characteristics, including …the changes in the energy of MBN signal, the peak position and the shape of MBN signal profile. Show more

Keywords: Magnetic Barkhausen noise, DC magnetic field, signal characteristics, pipeline

DOI: 10.3233/JAE-209402

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Dong, Ting | Huang, Juyan | Peng, Bing | Jian, Ling

Article Type: Research Article

Abstract: The calculation accuracy of unbalanced magnetic forces (UMF) is very important to the design of rotor length, because it will effect the shaft deflection. But in some permanent magnet synchronous motors (PMSMs) with fractional slot concentrated windings (FSCW), the UMF caused by asymmetrical stator topology structure is not considered in the existing deflection calculation, which is very fatal for the operational reliability, especially for the PMSMs with the large length-diameter ratio, such as submersible PMSMs. Therefore, the part of UMF in the asymmetrical stator topology structure PMSMs caused by the choice of pole-slot combinations is analysized in this paper, and …a more accurate rotor deflection calculation method is also proposed. Show more

Keywords: Unbalanced magnetic force (UMF), permanent magnet synchronous motor (PMSM), fractional slot concentrated winding (FSCW), pole-slot combinations, deflection calculation

DOI: 10.3233/JAE-209466

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Hu, Bin | Li, Tao Yun | Shen, GongTian | Wan, Benli

Article Type: Research Article

Abstract: The leakage magnetic field which induced by the inner surface groove during loading had been measured from the outer surface in geomagnetic environment. Compared the variation of the leakage magnetic field along the load with the location and development of the groove, it was found that two phenomena are relate to the magnetic field aberration. The relation can be described by the pink-pink value and the gradient of the magnetic field aberration. This result can be used to evaluate and monitor the inner defect by the magnetic field aberration characters.

Keywords: Leakage magnetic field, variation, inner surface groove, loading, geomagnetic environment

DOI: 10.3233/JAE-209474

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-8, 2020

Authors: Narawa, Yasuhiro | Ishihara, Sora | Yamaguchi, Ryo | Bessho, Takahiko | Liu, Xiaojun | Kato, Taro | Ikeda, Keigo | Endo, Ayato | Narita, Takayoshi | Kato, Hideaki

Article Type: Research Article

Abstract: To obtain the static shape of the continuous steel plate and vibration characteristic, we performed the analysis of the multi-body dynamics in which the continuous steel plate was discretized in many solid bodies. The shape of the steel plate obtained by the measurement experiment was agreement with the static shape of the steel plate obtained by the analysis. Then, dynamical analysis was performed when white noise input to the steel plate. It was confirmed that the vibration could be suppressed when the electromagnets were installed in consideration of the static shape of the steel plate.

Keywords: Active seat suspension, ultra-compact vehicle, motor design

DOI: 10.3233/JAE-209461

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-9, 2020