Gear efficiency estimation method through finite element and curve fitting

Halim, Mohd Firdaus Mohd Ab; Sulaiman, Erwan; Othman, Raja Nor Firdaus K. Raja

doi:10.3233/jae-201576

Cited by 3 publications

(4 citation statements)

References 34 publications

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“…where P w1 is the windage loss of the driving gear and P w2 is the windage loss of the driven gear. These can be calculated from relationships (12) and (13).…”

Section: The Gearbox Modelmentioning

confidence: 99%

“…The main difficulty with joint optimization is that the efficiency of the gearbox decreases as the gear ratio increases (see [12]), while the efficiency of the electric motor increases (see [13]). In this paper, this contradiction ïs illustrated through a joint operatingpoint-based optimization of an electric motor and its coupled geared drive.…”

Section: Introductionmentioning

confidence: 99%

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Investigating the Effect of Gear Ratio in the Case of Joint Multi-Objective Optimization of Electric Motor and Gearbox

Istenes,

Polák

2024

Energies

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In this paper, a software framework is presented through an application that is able to jointly optimize an electric motor and a gearbox for the design of a drive system for electric vehicles. The framework employs a global optimization method and uses both analytical and finite element method (FEM) models to evaluate the objective functions. The optimization process is supported by a statistical surrogate model, which allows a large reduction of runtime. An earlier version of this framework was only suitable for electric motor optimization. In the application presented in a previous paper, the motor of a belt-driven electric drive system was optimized. In this paper, the optimization of the same drive system is shown, but now with a combined optimization of a gear drive and motor. The objective functions of optimization are minimizing the total loss energy and the weight of the drive system. The optimization results are compared with previous results to demonstrate the further potential of joint optimization.

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“…where P w1 is the windage loss of the driving gear and P w2 is the windage loss of the driven gear. These can be calculated from relationships (12) and (13).…”

Section: The Gearbox Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigating the Effect of Gear Ratio in the Case of Joint Multi-Objective Optimization of Electric Motor and Gearbox

Istenes,

Polák

2024

Energies

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“…CMG uses the flux modulation principle to transfer torque and speed from the input rotor to the output rotor. Figure 2 illustrates the structure of CMG [12]. CMG consists of 2 rotors, an inner pole pair (IPP) and outer pole pair (OPP).…”

Section: Formulation Of Gear Ratio Equation Of Rpmg From Cmg Fundamen...mentioning

confidence: 99%

Birkaç kutup çifti kombinasyonunda CMG ve RPMG'nin dişli faktörünün araştırılması

Halim

Sulaiman

Rahman

2023

ECJSE

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The design on magnetic gear (MG) involves determining the gear ratio specific to its application. The gear ratio can be determined by the pole number of the inner rotor, outer rotor and the pole piece. In this research, the cogging torque of several pole pair combinations in concentric magnetic gear (CMG) and rotating pole piece magnetic gear (RPMG) were investigated. The gear ratio equations were initially derived for both CMG and RPMG. Based on these equations, four sets of pole pair combinations were determined. The cogging factor was calculated in each combination. To determine the cogging factor significance towards the cogging torque, the magnetic gears were simulated in 2D finite element software. The result revealed that the lower pole pair combination generates lower cogging torque than the higher pole pair combination. The simulation result also shows that the rate of increase in cogging factor did not correlate directly to the cogging torque in the simulation. It is concluded that the cogging factor is not a suitable tool to access the cogging torque level in CMG and RPMG.

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“…where Peddy, Ke, f, Bm and d are the eddy current loss, eddy current loss coefficient, magnetic field frequency in s -1 , magnetic field density, thickness of the material and the material volume respectively [11], [12]. The understanding of the CMG loss is crucial before it can be applied as efficient torque converter.…”

Section: Introductionmentioning

confidence: 99%

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

Halim

Sulaiman

Jenal

et al. 2022

IJECE

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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.

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Gear efficiency estimation method through finite element and curve fitting

Cited by 3 publications

References 34 publications

Investigating the Effect of Gear Ratio in the Case of Joint Multi-Objective Optimization of Electric Motor and Gearbox

Investigating the Effect of Gear Ratio in the Case of Joint Multi-Objective Optimization of Electric Motor and Gearbox

Birkaç kutup çifti kombinasyonunda CMG ve RPMG'nin dişli faktörünün araştırılması

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

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