scholarly journals Comparative Analysis and Design of the Shielding Techniques in WPT Systems for Charging EVs

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2115 ◽  
Author(s):  
Linlin Tan ◽  
Kamal Eldin Idris Elnail ◽  
Minghao Ju ◽  
Xueliang Huang
Keyword(s):  
Finite Element Method ◽  
Electric Vehicles ◽  
System Performance ◽  
Human Exposure ◽  
System Efficiency ◽  
Shielding Effectiveness ◽  
Wireless Power ◽  
Analysis And Design ◽  
Reactive Current ◽  
Simulation Results

Wireless power transfer (WPT) systems for charging Electric Vehicles (EVs) have gained extensive attention due to their many advantages. However, human exposure to electromagnetic fields (EMFs) has become a serious concern in high-power cases. In this paper, shielding techniques, including magnetic, metallic, and resonant reactive current shields, are investigated. Finite element method software is used to evaluate and compare the shielding effectiveness, charger weight, and system performance. The results show that the resonant reactive current shielding has a low EMF level with reasonable system efficiency and acceptable charger weight. In addition, 5 kW with 15 cm air gap WPT chargers were built to validate the simulation results.

scholarly journals Evaluation of Human Exposure οwing to Wireless Power Transfer Systems in Electric Vehicles

2019 ◽  
Vol 6 (4) ◽  
pp. 239-258
Author(s):  
Adel Razek ◽  
Lionel Pichon ◽  
Abelin Kameni ◽  
Ludovic Makong ◽  
Sahand Rasm
Keyword(s):  
Electric Vehicles ◽  
Human Exposure ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power

scholarly journals Study of the Circular Flat Spiral Coil Structure Effect on Wireless Power Transfer System Performance

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2875 ◽  
Author(s):  
Xu Liu ◽  
Chenyang Xia ◽  
Xibo Yuan
Keyword(s):  
System Performance ◽  
Outer Radius ◽  
Design Parameters ◽  
System Efficiency ◽  
Power Transfer ◽  
Coil Design ◽  
Wireless Power ◽  
Coil System ◽  
Power Transfer Efficiency ◽  
Flat Spiral

This paper analyses the relationship between the coil design parameters and the system performance, including power transfer efficiency and amount, when circular flat spiral coils are adopted in a wireless power transfer (WPT) system. Coil design variables including outer radius, inner radius, channel width and coil turns are thoroughly studied to improve the system performance with a limited maximum outer radius for practical purposes. A two-coil WPT system has been built to verify the analysis, and the experimental results show good consistency with the theoretical calculations and simulation results, which show that the coil design parameters have a significant impact on the system performance, even with the same coil size. In the experiments, the coil-to-coil distance is 150 mm, the maximum coil outer radius is limited in 300 mm, and the DC input voltage and the load resistance are 100 V and 5 Ω, respectively. When the coils are tightly-wound in the most traditional way to maximize the coil size, the coil-system efficiency is 62.6% with only 4.5 W load power. In contrast, the efficiency optimized coil can improve the coil-system efficiency to 91.2% with the outer radius stayed the same. Besides, when the power transfer efficiency and amount are considered simultaneously, the system can achieve 1279 W load power with 85.94% coil-system efficiency.

Incomplete Rationality vs. Incomplete Strategy in Minority Game Model

2012 ◽  
Vol 629 ◽  
pp. 735-740
Author(s):  
Xiao Bo Yao ◽  
Chuan Feng Han ◽  
Shao Long Wan
Keyword(s):  
Game Theory ◽  
System Performance ◽  
Control Parameter ◽  
Game Model ◽  
System Efficiency ◽  
Minority Game ◽  
Random Strategy ◽  
Simulation Results

Based on standard minority game, an Irrationality Agent Minority Game (IAMG) model is proposed, in which agents are less rational to make use of its strategy properly at each step. The control parameter of irrationality, pI, represents the probability of an agent acting irrationally, which could be explained with the personal defect. Like the incomplete (strategy) minority game (IMG) model introduced in our previous paper, this IAMG model also has three failsafe mode including (R0) random action, (R1) random strategy and (R4)”Back- to-Best”. The IAMG model can be explain with analytic equations similar with the IMG, and simulation results match the trend of the conclusion. Irrationality shows a great effect on system efficiency, and system efficiency reaches its top value at a smaller pIc than pIc in IMG. The IAMG and IMG model can be used to explain the deviation of some game theory simulations, and to understand the system performance with abundant agents of various characters.

scholarly journals Increasing Electric Vehicles Reliability by Non-Invasive Diagnosis of Motor Winding Faults

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2510
Author(s):  
Konrad Górny ◽  
Piotr Kuwałek ◽  
Wojciech Pietrowski
Keyword(s):  
Electric Vehicles ◽  
Diagnostic Method ◽  
Induction Motors ◽  
Early Stage ◽  
Short Circuit ◽  
Damage Classification ◽  
Non Invasive ◽  
Signal Features ◽  
Empirical Wavelet Transform ◽  
Simulation Results

The article proposes a proprietary approach to the diagnosis of induction motors allowing increasing the reliability of electric vehicles. This approach makes it possible to detect damage in the form of an inter-turn short-circuit at an early stage of its occurrence. The authors of the article describe an effective diagnostic method using the extraction of diagnostic signal features using an Enhanced Empirical Wavelet Transform and an algorithm based on the method of Ensemble Bagged Trees. The article describes in detail the methodology of the carried out research, presents the method of extracting features from the diagnostic signal and describes the conclusions resulting from the research. Phase current waveforms obtained from a real object as well as simulation results based on the field-circuit model of an induction motor were used as a diagnostic signal in the research. In order to determine the accuracy of the damage classification, simple metrics such as accuracy, sensitivity, selectivity, precision as well as complex metrics weight F1 and macro F1 were used.

Analysis and Design of EIT-Like Magnetic Coupling Wireless Power Transfer Systems

2021 ◽  
pp. 1-11
Author(s):  
Zhi-Juan Liao ◽  
Qi-Kai Feng ◽  
Chen-Hui Jiang ◽  
Fan Wu ◽  
Chen-Yang Xia ◽  
...  
Keyword(s):  
Magnetic Coupling ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Analysis And Design

scholarly journals 3D Simulation-Based Acoustic Wave Resonator Analysis and Validation Using Novel Finite Element Method Software

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2715
Author(s):  
Ruth Yadira Vidana Morales ◽  
Susana Ortega Cisneros ◽  
Jose Rodrigo Camacho Perez ◽  
Federico Sandoval Ibarra ◽  
Ricardo Casas Carrillo
Keyword(s):  
Finite Element ◽  
High Performance ◽  
Cloud Services ◽  
3D Simulation ◽  
3D Simulations ◽  
Acoustic Resonators ◽  
Analysis And Design ◽  
Wave Resonator ◽  
Film Bulk ◽  
Simulation Results

This work illustrates the analysis of Film Bulk Acoustic Resonators (FBAR) using 3D Finite Element (FEM) simulations with the software OnScale in order to predict and improve resonator performance and quality before manufacturing. This kind of analysis minimizes manufacturing cycles by reducing design time with 3D simulations running on High-Performance Computing (HPC) cloud services. It also enables the identification of manufacturing effects on device performance. The simulation results are compared and validated with a manufactured FBAR device, previously reported, to further highlight the usefulness and advantages of the 3D simulations-based design process. In the 3D simulation results, some analysis challenges, like boundary condition definitions, mesh tuning, loss source tracing, and device quality estimations, were studied. Hence, it is possible to highlight that modern FEM solvers, like OnScale enable unprecedented FBAR analysis and design optimization.

Sign in / Sign up

Export Citation Format

Share Document