Eddy current loss and its magnetization effect of electromagnetic buffer under intensive impact load

2020 ◽  
pp. 1-20
Author(s):  
Zixuan Li ◽  
Guolai Yang ◽  
Ning Liu
Keyword(s):  
Energy Density ◽  
Eddy Current ◽  
Impact Load ◽  
Current Model ◽  
High Energy ◽  
Eddy Current Loss ◽  
High Energy Density ◽  
Time Step ◽  
Current Loss ◽  
The Impact

In this paper, a high-energy density electromagnetic buffer (EMB) is studied and analysed for the violent acceleration and high velocity of intensive impact loads. First, the design requirements of the EMB are proposed to select reasonable structure and magnetic circuit parameters. The equivalent current model is used to introduce the primary eddy current affected by demagnetization effect and the induced secondary eddy current. The magnetization process is studied by dividing the conductor tube into the approach end and the departure end. Considering the nonlinear damping and eddy current interaction between primary and secondary, a primary-secondary eddy current loss coupled nonlinear time-step finite element model (FEM) is established to obtain the spatiotemporal distribution characteristics of eddy current. Finally, a test experiment with weak impact, medium impact and intensive impact was carried out. The measured displacement, velocity, damping force, and time nodes responses during buffering are consistent with the established time-step FEM results. The proposed high-energy density EMB can effectively complete the impact buffering process. It is reasonable to obtain the eddy current loss and its magnetization law from the established FEM which is suitable for shock buffering with different impulse strength.

Gear efficiency estimation method through finite element and curve fitting

2021 ◽  
pp. 1-19
Author(s):  
M.F.M.A. Halim ◽  
E. Sulaiman ◽  
R.N.F.K.R. Othman
Keyword(s):  
Finite Element ◽  
Eddy Current ◽  
Curve Fitting ◽  
High Energy ◽  
Gear Ratio ◽  
Eddy Current Loss ◽  
High Energy Density ◽  
Current Loss ◽  
Finite Element Software ◽  
Gear Efficiency

The inclusion of high energy density permanent magnet (PM) in MG contributes to the high eddy current loss in magnetic gear and reduces its efficiency. There was limited research done that focused on gear efficiency behavior over a broader range of speed and in different gear ratios. In this paper, the function of gear efficiency concerning gear ratio and rotational speed is proposed. Torque and eddy current loss data were obtained through transient magnetic analysis using finite element software at several rotational ranges and gear ratios. The analytical approach through mathematical substitution was discussed to confirm the finding in the simulation. The result showed that the gear efficiency decreases as the speed increases. Nonetheless, the gear efficiency revealed improvement in efficiency as the gear ratio increases. Finally, gear efficiency behavior was modeled using the curve fitting method. Subsequently, based on the correlation study, an equation was proposed, yielding a 1% error compared to the new simulated data. With this proposed method and equation, the analysis and estimation of gear efficiency behavior over wider speed and gear ratios are simplified, thus reducing the need to perform simulation over different speeds and gear ratios.

scholarly journals Preliminary analysis of eddy current and iron loss in magnetic gear in electric vehicle

2022 ◽  
Vol 12 (2) ◽  
pp. 1161
Author(s):  
Mohd Firdaus Mohd Ab Halim ◽  
Erwan Sulaiman ◽  
Mahyuzie Jenal ◽  
Raja Nor Firdaus Kashfi Raja Othman ◽  
Syed Muhammad Naufal Syed Othman
Keyword(s):  
Electric Vehicle ◽  
Eddy Current ◽  
High Speed ◽  
High Energy ◽  
Gear Ratio ◽  
Eddy Current Loss ◽  
High Energy Density ◽  
Iron Loss ◽  
Current Loss ◽  
Magnetic Gear

The inclusion of a high energy density permanent magnet into magnetic gear improves the machine's torque density. However, it also contributes to eddy current loss, especially in a high-speed application such in electric vehicle. In this paper, the losses from eddy current and iron loss are investigated on concentric magnetic gear (CMG). Torque multiplier CMG is designed with 8/3 gear ratio for this study. Iron loss and eddy current loss are compared and discussed. Based on this study, eddy current loss contributes to almost 96% of the total loss. This finding is hoped to direct the researcher to focus more on reducing loss associated with eddy current loss.

The impact of Hall physics on magnetized high energy density plasma jets

2014 ◽  
Vol 21 (5) ◽  
pp. 056307 ◽  
Author(s):  
P.-A. Gourdain ◽  
C. E. Seyler ◽  
L. Atoyan ◽  
J. B. Greenly ◽  
D. A. Hammer ◽  
...  
Keyword(s):  
Energy Density ◽  
High Energy ◽  
Plasma Jets ◽  
High Energy Density ◽  
The Impact ◽  
Density Plasma

Thermal Analysis of Canned Induction Motor for Coolant Pump Considering the Eddy Current Loss in Cans

2010 ◽  
Vol 670 ◽  
pp. 466-476 ◽  
Author(s):  
Jian Li ◽  
Jung Tae Song ◽  
Yun Hyun Cho
Keyword(s):  
Thermal Analysis ◽  
Finite Element ◽  
Induction Motor ◽  
Eddy Current ◽  
Three Dimensional ◽  
Eddy Current Loss ◽  
Time Step ◽  
Coolant Pump ◽  
Current Loss ◽  
Canned Motor

This paper describes thermal analysis of canned induction motor for coolant pump considering eddy current loss. The electromagnetic field of a canned motor was analyzed by using the time-step finite element method, and the eddy loss was obtained. Equivalent circuit considering can loss was developed and the equitation to calculate can loss was derived from theory of conventional motor. Using the loss from electromagnetic analysis as heat source of temperature field, thermal analysis was conducted by three dimensional finite element analyses. The simulation results show good agreement with experiment data, which indicates that this method has good accuracy and reliability for dealing with thermal behavior of canned motor.

scholarly journals Cation-disordered rocksalt transition metal oxides and oxyfluorides for high energy lithium-ion cathodes

2020 ◽  
Vol 13 (2) ◽  
pp. 345-373 ◽  
Author(s):  
R. J. Clément ◽  
Z. Lun ◽  
G. Ceder
Keyword(s):  
Energy Density ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Short Range ◽  
Short Range Order ◽  
Lithium Ion ◽  
High Energy ◽  
High Energy Density ◽  
Detailed Understanding ◽  
The Impact

Cation-disordered rocksalt oxides and oxyfluorides are promising high energy density lithium-ion cathodes, yet require a detailed understanding of the impact of disorder and short-range order on the structural and electrochemical properties.

Steady and Pulsed Flow Performance Trends of Higher Concentration DMFCs

2006 ◽  
Author(s):  
Larry McCarthy ◽  
Comas Haynes
Keyword(s):  
Energy Density ◽  
Direct Methanol Fuel Cells ◽  
High Energy ◽  
Operating Conditions ◽  
High Energy Density ◽  
Methanol Crossover ◽  
Fuel Delivery ◽  
Fuel Mixtures ◽  
The Impact ◽  
Promising Source

Direct methanol fuel cells (DMFCs) are a promising source of energy due to their potentially high energy density, facilitated fuel delivery and storage, and precluded fuel processing. However, DMFCs have several challenges which need to be resolved before they can replace existing energy sources. Some of these challenges include lower power density, relatively high cost, and uncertain reliability. These issues are all promoted, at least in part, by the methanol crossover phenomenon, wherein membrane permeability allows the undesirable species transport of methanol from the anode to the cathode. This phenomenon also causes the requirement of dilute fuel mixtures, which is undesirable from an energy density viewpoint. Prior research has shown that methanol crossover can be reduced by operating DMFCs in a transient mode [1,2]. Thus, a study has been performed to investigate the impact of hydraulic pulsing (HP) at different operating conditions, such as fuel concentration, current density, and number-of-stoichs (NOS). Furthermore, the cell’s performance is being characterized at different steady flow concentrations to highlight the impact of fuel dilution.

scholarly journals Energy storage: dielectrophores – molecules with non-linear polarizability

2017 ◽  
Vol 17 (4) ◽  
pp. 14-21 ◽  
Author(s):  
L. Mourokh ◽  
P. Lazarev
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Selection Process ◽  
High Energy ◽  
Molecular Engineering ◽  
High Energy Density ◽  
High Resistivity ◽  
Energy Storage Devices ◽  
Non Linear ◽  
The Impact

Abstract We examine the feasibility of film capacitors based on dielectrics with high non-linear polarizability as energy storage devices. Capacitors with increased energy density can be built by using composite materials with aromatic molecules (high polarizability) and envelope of alkyl tails (high resistivity). We determine the impact of the second order non-linearity onto energy density and translate high energy density requirements into molecular parameters necessary for high-performance capacitors. The relationship of permittivity and molecular polarizability is obtained by means of the non-linear Clausius–Mossotti equation. In order to demonstrate the the selection process for the molecular composition of dielectrophores, we compare several molecules, using quantum chemistry algorithms (Gaussian09). Starting from Langhals perylene (LP), we proceed with the nitrophenyl-perylene having one NH2 group (donor) and one NO2 group (acceptor). We show that, while their linear polarizabilities are comparable, the hyperpolarizabilities differ by several orders of the magnitudes. Two NH2 and NO2 groups can be attached to the nitro-naphthalene-perylene further increasing of the hyperpolarizability. Even larger polarization can be achieved by additional rylene groups increasing the polarizable electronic mass. We demonstrate that with such molecular engineering, capacitors can have the energy density which is attractive for practical applications.

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