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.

scholarly journals Calculation and Analysis of Permanent Magnet Eddy Current Loss Fault with Magnet Segmentation

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Bing Li ◽  
Ming Li
Keyword(s):  
Finite Element ◽  
Permanent Magnet ◽  
Eddy Current ◽  
Permanent Magnet Synchronous Motor ◽  
Element Model ◽  
Synchronous Motor ◽  
Eddy Current Loss ◽  
Space Harmonic ◽  
Current Loss ◽  
Finite Element Software

This paper investigates the problem of calculating and analyzing the effect of the permanent magnet eddy current loss fault due to magnet segmentation. Taking an interior permanent magnet synchronous motor with inverter supplied as an example, the rated power of motor was 2.2 kW. Three-dimensional finite-element model was firstly established based on finite-element software. Then, the model mesh and boundary conditions were handled specially; permanent magnet eddy current loss fault was calculated and analyzed theoretically with magnet segmentation from space harmonic and time harmonic, respectively. Finally, calculation results were compared and explained. A useful conclusion for permanent magnet synchronous motor design has been obtained.

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.

Effect of DC Supply Voltage on Eddy Current Loss in Permanent Magnet of Permanent Magnetic Synchronous Motor for Electric Vehicle Application

2013 ◽  
Vol 310 ◽  
pp. 262-265
Author(s):  
Xiao Peng Wu ◽  
Cheng Ning Zhang ◽  
Yu Gang Dong
Keyword(s):  
Finite Element ◽  
Permanent Magnet ◽  
Eddy Current ◽  
Supply Voltage ◽  
Element Model ◽  
Eddy Current Loss ◽  
Eddy Current Losses ◽  
Current Loss ◽  
Time Stepping ◽  
The Finite Element Model

The 2-D time-stepping finite element method is adopted to systematically analyze the effect of DC supply voltage of inverter on eddy current loss in permanent magnet of PMSM for EV application. The finite element model and inverter model are built to calculate the winding currents, eddy current losses in permanent magnet and air-gap flux densities with different DC supply voltages when the motor runs in flux-weakening area. Analysis shows that, the eddy current increases significantly with the increase of DC supply voltage, although the fundamental winding current decreases. The temperature-rise experiment of permanent magnet is carried out, proving the validity of analysis.

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 Analysis of eddy current loss in magnetic coupling based on three-dimensional finite element calculation

2021 ◽  
Vol 2093 (1) ◽  
pp. 012039
Author(s):  
Xiaoyue Wang ◽  
Liang Cai ◽  
Yanqin Mao ◽  
Wanjun Guo
Keyword(s):  
Finite Element ◽  
Eddy Current ◽  
Three Dimensional ◽  
Magnetic Coupling ◽  
Eddy Current Loss ◽  
Finite Element Calculation ◽  
Element Calculation ◽  
Current Loss ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Abstract Considering the end effect, the three-dimensional finite element calculation model of the magnetic coupling is established. The three-dimensional distribution nephogram of the induced current and eddy current loss on the isolation cover is obtained, and the distribution trends of the two are consistent. The influence of size, material, and operating condition of magnetic coupling on eddy current loss is studied. The results show that the selection of isolation material with high resistivity and the reduction of isolation thickness are helpful to reduce the eddy current loss. The higher the rotating speed of the magnetic coupling, the greater the eddy current loss. At the same speed, the greater the load, the greater the magnetic declination, the smaller the eddy current loss. The research results can provide a reference for reducing energy loss and cooling structure design of magnetic coupling.

Finite Element Analysis of AMB Eddy-Current Loss in HTR-PM Primary Helium Circulator

2018 ◽  
Author(s):  
Jinpeng Yu ◽  
Yan Zhou ◽  
Mo Ni ◽  
Guojun Yang ◽  
Lei Zhao
Keyword(s):  
Magnetic Field ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Eddy Current ◽  
Electromagnetic Force ◽  
Eddy Current Loss ◽  
Element Analysis ◽  
Current Loss ◽  
Resistance Torque ◽  
Current Magnetic Field

In the active magnetic bearing (AMB) system, the eddy current is generated during the rotation of the rotor, which brings about the AMB loss and eddy-current magnetic field. The eddy-current magnetic field will reduce the electromagnetic force and generate the resistance torque of the AMB. Basing on the AMB of the Primary Helium Circulator (PHC) in HTR-PM, two-dimensional (2D) and three-dimensional (3D) AMB models are built and analyzed with finite element analysis (FEA) in maxwell. The 2D FEA shows that the eddy-current loss and the resistance torque increase as the rotor speed increases, and the eddy-current magnetic field will affect the air-gap magnetic field and reduce the electromagnetic force. The 3D FEA shows that dividing the rotor in insulate sheets can reduce the eddy-current loss. The loss and the sheets thickness have a linear relationship, which is different from the theoretical analysis.

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